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time-dilation × 51black-hole × 18
space-time × 18
general-relativity × 9
special-relativity × 8
gravity × 7
time × 6
supermassive-black-hole × 4
expansion × 3
redshift × 3
star × 2
orbit × 2
astrophysics × 2
cosmology × 2
universe × 2
space × 2
big-bang-theory × 2
hubble-constant × 2
planet × 1
the-moon × 1
galaxy × 1
earth × 1
light × 1
distances × 1
orbital-mechanics × 1
